﻿using Grand.Business.Core.Interfaces.Common.Directory;
using Grand.Business.Core.Interfaces.Common.Localization;
using Grand.Business.Core.Interfaces.Common.Security;
using Grand.Business.Core.Interfaces.Marketing.Courses;
using Grand.Business.Core.Interfaces.Storage;
using Grand.Domain.Permissions;
using Grand.Domain.Courses;
using Grand.Domain.Customers;
using Grand.Infrastructure;
using Grand.Web.Commands.Models.Courses;
using Grand.Web.Common.Controllers;
using Grand.Web.Features.Models.Courses;
using MediatR;
using Microsoft.AspNetCore.Mvc;
using Grand.SharedKernel.Attributes;

namespace Grand.Web.Controllers;

[ApiGroup(SharedKernel.Extensions.ApiConstants.ApiGroupNameV2)]
public class CourseController : BasePublicController
{
    private readonly IAclService _aclService;
    private readonly ICourseLessonService _courseLessonService;
    private readonly ICourseService _courseService;
    private readonly CourseSettings _courseSettings;
    private readonly IDownloadService _downloadService;
    private readonly IGroupService _groupService;
    private readonly IMediator _mediator;
    private readonly IPermissionService _permissionService;
    private readonly ITranslationService _translationService;
    private readonly IWorkContextAccessor _workContextAccessor;

    public CourseController(
        IPermissionService permissionService,
        IAclService aclService,
        IWorkContextAccessor workContextAccessor,
        IGroupService groupService,
        ITranslationService translationService,
        ICourseService courseService,
        ICourseLessonService courseLessonService,
        IDownloadService downloadService,
        IMediator mediator,
        CourseSettings courseSettings)
    {
        _permissionService = permissionService;
        _aclService = aclService;
        _workContextAccessor = workContextAccessor;
        _groupService = groupService;
        _translationService = translationService;
        _courseService = courseService;
        _courseLessonService = courseLessonService;
        _downloadService = downloadService;
        _mediator = mediator;
        _courseSettings = courseSettings;
    }

    protected async Task<bool> CheckPermission(Course course, Customer customer)
    {
        //Check whether the current user is a guest
        if (await _groupService.IsGuest(customer) && !_courseSettings.AllowGuestsToAccessCourse) return false;

        //Check whether the current user has a "Manage course" permission
        //It allows him to preview a category before publishing
        if (!course.Published && !await _permissionService.Authorize(StandardPermission.ManageCourses, customer))
            return false;

        //Check whether the current user purchased the course
        if (!await _mediator.Send(new GetCheckOrder { Course = course, Customer = customer })
            && !await _permissionService.Authorize(StandardPermission.ManageCourses, customer))
            return false;

        //ACL (access control list)
        return _aclService.Authorize(course, customer) &&
               //Store access
               _aclService.Authorize(course, _workContextAccessor.WorkContext.CurrentStore.Id);
    }

    [HttpGet]
    public virtual async Task<IActionResult> Details(string courseId)
    {
        var customer = _workContextAccessor.WorkContext.CurrentCustomer;

        var course = await _courseService.GetById(courseId);
        if (course == null)
            return InvokeHttp404();

        if (!await CheckPermission(course, customer))
            return InvokeHttp404();

        //display "edit" (manage) link
        if (await _permissionService.Authorize(StandardPermission.ManageAccessAdminPanel, customer) &&
            await _permissionService.Authorize(StandardPermission.ManageCourses, customer))
            DisplayEditLink(Url.Action("Edit", "Course", new { id = course.Id, area = "Admin" }));

        //model
        var model = await _mediator.Send(new GetCourse {
            Course = course,
            Customer = _workContextAccessor.WorkContext.CurrentCustomer,
            Language = _workContextAccessor.WorkContext.WorkingLanguage
        });

        return View(model);
    }

    [HttpGet]
    public virtual async Task<IActionResult> Lesson(string id)
    {
        var customer = _workContextAccessor.WorkContext.CurrentCustomer;

        var lesson = await _courseLessonService.GetById(id);
        if (lesson == null)
            return InvokeHttp404();

        var course = await _courseService.GetById(lesson.CourseId);
        if (course == null)
            return InvokeHttp404();

        if (!await CheckPermission(course, customer))
            return InvokeHttp404();

        //display "edit" (manage) link
        if (await _permissionService.Authorize(StandardPermission.ManageAccessAdminPanel, customer) &&
            await _permissionService.Authorize(StandardPermission.ManageCourses, customer))
            DisplayEditLink(Url.Action("EditLesson", "Course", new { id = lesson.Id, area = "Admin" }));

        //model
        var model = await _mediator.Send(new GetLesson {
            Course = course,
            Customer = _workContextAccessor.WorkContext.CurrentCustomer,
            Language = _workContextAccessor.WorkContext.WorkingLanguage,
            Lesson = lesson
        });

        return View(model);
    }

    [HttpGet]
    public virtual async Task<IActionResult> DownloadFile(string id)
    {
        var customer = _workContextAccessor.WorkContext.CurrentCustomer;

        var lesson = await _courseLessonService.GetById(id);
        if (lesson == null || string.IsNullOrEmpty(lesson.AttachmentId))
            return InvokeHttp404();

        var course = await _courseService.GetById(lesson.CourseId);
        if (course == null)
            return InvokeHttp404();

        if (!await CheckPermission(course, customer))
            return InvokeHttp404();

        var download = await _downloadService.GetDownloadById(lesson.AttachmentId);
        if (download == null)
            return Content("No download record found with the specified id");

        if (download.UseDownloadUrl)
            return new RedirectResult(download.DownloadUrl);

        //use stored data
        if (download.DownloadBinary == null)
            return Content($"Download data is not available any more. Download GD={download.Id}");

        var fileName = !string.IsNullOrWhiteSpace(download.Filename) ? download.Filename : download.Id;
        var contentType = !string.IsNullOrWhiteSpace(download.ContentType)
            ? download.ContentType
            : "application/octet-stream";
        return new FileContentResult(download.DownloadBinary, contentType) {
            FileDownloadName = fileName + download.Extension
        };
    }

    [HttpGet]
    public virtual async Task<IActionResult> VideoFile(string id)
    {
        var customer = _workContextAccessor.WorkContext.CurrentCustomer;

        var lesson = await _courseLessonService.GetById(id);
        if (lesson == null || string.IsNullOrEmpty(lesson.VideoFile))
            return InvokeHttp404();

        var course = await _courseService.GetById(lesson.CourseId);
        if (course == null)
            return InvokeHttp404();

        if (!await CheckPermission(course, customer))
            return InvokeHttp404();

        var download = await _downloadService.GetDownloadById(lesson.VideoFile);
        if (download == null)
            return Content("No download record found with the specified id");

        if (download.UseDownloadUrl)
            return new RedirectResult(download.DownloadUrl);

        //use stored data
        if (download.DownloadBinary == null)
            return Content($"Download data is not available any more. Download GD={download.Id}");

        var fileName = !string.IsNullOrWhiteSpace(download.Filename) ? download.Filename : download.Id;
        var contentType = !string.IsNullOrWhiteSpace(download.ContentType)
            ? download.ContentType
            : "video/mp4";
        return new FileContentResult(download.DownloadBinary, contentType) {
            FileDownloadName = fileName + download.Extension
        };
    }

    [HttpGet]
    public virtual async Task<IActionResult> Approved(string id)
    {
        var customer = _workContextAccessor.WorkContext.CurrentCustomer;

        var lesson = await _courseLessonService.GetById(id);
        if (lesson == null)
            return Json(new { result = false });

        var course = await _courseService.GetById(lesson.CourseId);
        if (course == null)
            return Json(new { result = false });

        if (!await CheckPermission(course, customer))
            return Json(new { result = false });

        await _mediator.Send(new CourseLessonApprovedCommand
            { Course = course, Lesson = lesson, Customer = _workContextAccessor.WorkContext.CurrentCustomer });

        return Json(new { result = true });
    }
}